from Apps.data.models import article
from django.shortcuts import render_to_response
from django.template import RequestContext
import re
from django.db.models import Q

def normalize_query(query_string,
                    findterms=re.compile(r'"([^"]+)"|(\S+)').findall,
                    normspace=re.compile(r'\s{2,}').sub):
    ''' Splits the query string in invidual keywords, getting rid of unecessary spaces
        and grouping quoted words together.
        Example:
        >>> normalize_query('  some random  words "with   quotes  " and   spaces')
        ['some', 'random', 'words', 'with quotes', 'and', 'spaces']

    '''
    return [normspace(' ', (t[0] or t[1]).strip()) for t in findterms(query_string)]

def get_query(query_string, search_fields):
    ''' Returns a query, that is a combination of Q objects. That combination
        aims to search keywords within a model by testing the given search fields.

    '''
    query = None # Query to search for every search term
    terms = normalize_query(query_string)
    for term in terms:
        or_query = None # Query to search for a given term in each field
        for field_name in search_fields:
            q = Q(**{"%s__icontains" % field_name: term})
            if or_query is None:
                or_query = q
            else:
                or_query = or_query | q
        if query is None:
            query = or_query
        else:
            query = query & or_query
    return query

def search(request):
    query_string = ''
    found_entries = None
    if ('keywords' in request.POST) and request.POST.get('keywords', '').strip():
        query_string = request.POST.get('keywords', '')

        entry_query = get_query(query_string, ['title','contents',])

        found_entries = article.objects.filter(entry_query).order_by('-pubDate')

    return render_to_response('homepage/searchResult.html',
            { 'query_string': query_string, 'result': found_entries },
        context_instance=RequestContext(request))
"""
########################################################################
"""
def split_query_into_keywords(query):
    """Split the query into keywords,
    where keywords are double quoted together,
    use as one keyword."""
    keywords = []
    # Deal with quoted keywords
    while '"' in query:
        first_quote = query.find('"')
        second_quote = query.find('"', first_quote + 1)
        quoted_keywords = query[first_quote:second_quote + 1]
        keywords.append(quoted_keywords.strip('"'))
        query = query.replace(quoted_keywords, ' ')
        # Split the rest by spaces
    keywords.extend(query.split())
    return keywords

def search_for_keywords(keywords):
    """Make a search that contains all of the keywords."""
    art = article.objects.all()
    for keyword in keywords:
        arts = art.filter(title = keyword)
    return arts

"""
def search(request):
    if request.method == 'POST':
        #form = SearchForm(request.POST)
        if request.POST.get('keywords', ""):
            keywords = request.POST.get('keywords', "")
            keyword_list = split_query_into_keywords(keywords)
            posts = search_for_keywords(keyword_list)
            if posts:
            # Show the results
                return render_to_response("homepage/searchResult.html", {'art': posts}, context_instance=RequestContext(request))
    posts = []
    return render_to_response("homepage/searchResult.html", {'art': posts}, context_instance=RequestContext(request))
"""